Apparatus for measuring heat consumption



June 20, 1944. o. c. BRUN APPARATUS FOR MEASURING HEAT CONSUMPTION Filed Aug. 19, 1939 V n 6 w I gswa/wbob Oscar (a'nazanfin Bran,

' member'in question}:

means that even if no he individual consumers in the total heat consump- Patented June 20, 1944 irritants;

r Constantin, Brun,

ves ed? tion August 19, 1

:I'ABilHOa ,In-Denmark radiators-and g 1 plants :is ordinarily of a' liquid: from "con- The consumption of heat from hot-water-cocks inheatin measured; by evaporation tainersi enclosedin meters; which are arranged at each individual heat (1 elivering member of the. v5 heating. plant so as to'lbe heateddrom the said 7 an s -neat, because ng. point of this-"liquidiis suffi'ciently high Ordinarily the said 11' the-boili radiator. 15 of the said kind load evaporation, which at is delivered from the heating plant the meters would nevertheless record a consumption, viz. the said non-load evaporation, due to the fact that at ordinary roomtemperature a considerable amount of the measuring liquid, viz. tetraline, would evaporate. This causes an incorrectness of the result of the measuring, and this incorrectness is rather considerable and may amount to -50% of the recorded consumption. For this reason the recorded amount of heat cannot be relied upon as a base for the calculation of the share of the Now heat measuring meters have a considerable nontion from the heating pl It has been proposed t y fitting the measuring ant.

mental degree.

The object of the com aimed at is attained by the use of a measuring 55 the Alien Pro same IiitArr liquid, which from the air slowlyabsorbs humid- ,ity tovsuch 5 a: degree, thatthe amountgof humidwitya bso'rbed duringa .cert'ain timefby the 'mease uring liquid '-"is less; than=twice thezamount of the L said liquid, which at ordinaryroomet'emperature would evaporate..in the' course ofa :correspondi grtimen Y 5 I i If the measuringliquid absorbs fr'omth'e air an :amount 'of humidity less thantwicethe amount of liquid, which 'simultaneously disapload eva'porationfthenthis ab- 'sor ption -would cause -a "relativeincrease of the volume of theliquid contained in the meter, so that the observed descent of the surface of the liquid in the container of the meter would correspond not to the amount of liquid, which has evaporated, but to the difference between this amount of liquid and the volume of humidity absorbed from the air.

It would be obvious that, if this amount of liq uid is, less than twice the amount of the measuring liquid'evaporating at ordinary room-temperature, say about 68 F., the deviation of the registered consumption read on the measuring scale of the meter from the correct consumption would numerically be less than the incorrectness caused by the non-load evaporation.

Hitherto experts in the art have been of opinion that hygroscopic liquids are not applicable as measuring liquids in meters for measuring heat consumption by evaporation of a liquid, but this consideration must now be consideredto be incorrect, because a hygroscopic liquid, which fulfils the above mentioned requirement with respect to the amount of humidity absorbedfrom ess than the amount of. hexin the course of the measuring season evaporates at ordinary room-temperature. Theabsorbed humidity therefore partly compensates for the incorrectness, due to the non-load evaporation, since the absorption causes an apparent reduc of the non-load evaporation. For this reason rved that the evaporation of further the amount of hug, instance in the course of a tion of above or the more i "not be correct.

more correct registrations are read on the measuring scale of the meter.

Hexahydrophenol has this property, since it is a' solid material at ordinary room temperature and maintains its solid state as long as it has not had the occasion to absorb humidity. Hence the advantageis ,obtainedmby using hexahydrophenol' as a measuring liquid in meters of evaporation fitted with a wick, that the hexahydrophenol is not able to ascend the wick to the top of the same, from which the evaporation takes place; before it has been subjected to the' influence f heat. Therefore, a meter, which is supplieif withhexahydrophenol at a shorter .orilonger .time bel fore the commencement ofthefheatijng.sfea'som has practically no non-load evaporation and does not absorb humidity before-thehexahydropheriol is added which might cause an, elevation "of*t'he surface of the hexahydrophenol inthermeterg in which event the subsequent registrations; would The "sing1e figure'4of the :drawing :shows' liiasgramma'tically .za meteraaccording to ath'e invenwt'ionscomprisingia rtuberopeni at its rupperiendzand -with ianlenlarged tbulb at ithe :lower 1 end, Ffilled partly with hexahydrophenokand a wick. imscale indicates the degree of evaporation andsieonsequentlybf heatconsumpti'on. "The xtubeva' shows; :sbyJ-way of example, ;one .form of container 1 adaptedifor iuse in uneasuring .-.apparatus :of :thismaturegthe cenlargedibulb ibi-zat the lower end receiving land;- storing --.the-ihex ahydrophenol, herein shown as extending within the body portion of the tube to the surfacelever s. The wick tube h open at both ends, is fused at its upper end within the reduced top portion of 5 tube a, so that the bore of wick tube h is the only area in which'absorption or evaporation can take place. The ressure-equalizingaperture n in the "wick "tube, serves also as a filling :v'ent'," whenever it becomes necess 1,0 rThe lower end of ary to add 'hexahydrophenol. the wick tube h extends sub- """stantially to the bulb b, the wick w, of any suit- ".tablexnaterial, emerging from the bottom of tube "iliiinto the neck of the bulb. The upper end of v I the wick is-below the aperture n, and a porous I.";pad',.p.is;hownas resting upon the wick to assure uniform evaporating surface.

#innxindicatingichart c is shown exteriorly of he bddy of the tube a, and may be slitted as de- TSiEGdwtO readily show the varying levels s of the 90 measuring liquid, suitable calibrated indicia bei :arran'ged werticallyi on the rchart. :Hdiring znowzzparticularly described'and vascerrtainedi'theznature 'of myi'invention midzin what :imanner the I same' is 'ito :be .per dihat what'slrcl'aimzi'sz formed I declare 1Aiheatrconsumptionzmeter of thezevaporati'on type comprising an open containerzadaptedxo'be cheated .:by rarheat 'zdelivering imemb'era'and an .iamount zo'f .mexahydrophenol: in .said'zontainer Ltadapted :torhe aevapo'rated.

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